Larry's original question dealt with a 'free standing tower' i stand by
my original presumptions it should not move, free standing towers depend
inherently on deep engineered base footings and typically massive
concrete and steel construction. The 4 conditions/situations Bob
outlines below are interdependent and much more related to guyed towers.
Sure no one is guaranteed immunity, but if done following the engineered
instructions, free standing towers should exhibit a high resiliency from
all of these 4 conditions.
With the experience and extensive reader base of this list there will be
or have been exceptions, i have no doubt.
73 mac/mc w5mc
On 7/8/2019 1:29 PM, Bob Shohet, KQ2M wrote:
I can think of several reasons that a tower gets out of plumb:
1) Settling of ground around the tower base – especially when it is an
asymmetric combination of ledge and dirt - just look at what happens
to the doorjambs inside of houses – where the cracks appear. Also
foundation cracks seen in the concrete on the basement walls and
basement floors.
2) Minor earthquakes – Richter 1 – 2 range – the kind that you don’t
even feel or notice – we get those here in Connecticut
3) Hurricanes, tornados and damaging wind events – thankfully
infrequent but can certainly stretch the guys unequally (especially if
you have substantially different length guys like I do), physically
twist the tower, etc.
4) Large Ice storms with heavy ice which puts tremendous additional
weight on the tower and guys – even worse if there are strong winds
pushing on the heavily ice-encased tower and guys.
I have to realign the tower every so often by adjusting the guys to
straighten the tower and then resetting the tension on each guy. Each
tower and every guy wire should be rechecked at least annually and
preferably after a very severe storm.
Bob KQ2M
*From:* Mac <mailto:libbysales@austin.rr.com>
*Sent:* Monday, July 08, 2019 12:32 PM
*To:* towertalk@contesting.com <mailto:towertalk@contesting.com>
*Subject:* Re: [TowerTalk] Deviation from plumb
not much, if any..
it would drive me nuts if were not "plumb" no reason for it really ..
but it sounds like ur circumstances mite have one..
best: mac/mc w5mc
On 7/8/2019 10:34 AM, Larry Horlick wrote:
> What is the maximum deviation from plumb for a freestanding tower?
>
> Larry
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|